Aqualine AVB-075 3/4" atmospheric vacuum breaker:

• Heavy cast brass body
• Prevents contamination into fresh water lines
• Not for use as a main-line
• Smooth casting quality and full-sized waterways
  for maximum flow efficiency and minimum pressure loss
  
• High temperature seal ring
• Size: 3/4"
• Weight: 1.35 lb.
• Length: 3.25 in.
• Height: 2.38 in.
• Width: 2.75 in.
• Maximum water working pressure: 150 psi (10 bars)